用C语言的while循环语句编写1+11+111+1111+11111+????? +11???11最后是n个1

#includeint main(void){ int temp=0,ans=0; int i=0,n; scanf("%d",&n); while(i<n) { temp*=10; temp++; ans+=temp; i++; } printf("%d\n",ans); return 0;}